Anneli,
I respect and understand that you really want to get aboard Prinsendam.

However, it’s often difficult to get aboard ships for visits during their stop in port. But it can be done!
There’s not really a lot I can suggest. Perhaps you could stop by at a local travel agent and ask if they could help you out. Do Holland America Line have an office in Estonia? Is there an e-mail or telephone number you could try?
How many calls is Prinsendam due to make at Tallinn? Is there anyway you could visit the port and ask for their help? Or even contact the Port in Tallinn?
I am sorry, but I’m not quite sure what to suggest. Holland America Line isn’t a big contact of mine, I’ve only been aboard Eurodam, but that wasn’t an official visit, I only briefly stepped aboard to hand my drawing over to the Second Officer.
Sorry if this is not much help!

Bookmarks